springboot在工具类中读取配置文件（ClassPathResource）

青旅半醒 2023-06-25 03:29 27阅读 0赞

1、创建配置文件（application.properties）

spring.activemq.broker-url=tcp://localhost:61616
    spring.activemq.user=admin
    spring.activemq.password=admin
    spring.activemq.in-memory=true
    spring.activemq.pool.enabled=false

2、创建工具类（PropertiesUtil.java）

package com.jeff.utils;
    
    import java.io.IOException;
    import java.util.Properties;
    
    import org.springframework.core.io.ClassPathResource;
    import org.springframework.core.io.support.PropertiesLoaderUtils;
    
    public class PropertiesUtil { 
    
    	private static String user;
    
    	static { 
    		System.out.println("application.properties属性文件读取开始");
    		ClassPathResource resource = new ClassPathResource("application.properties");
    		try { 
    			Properties properties = PropertiesLoaderUtils.loadProperties(resource);
    			user = properties.getProperty("spring.activemq.user");
    			System.out.println("user的值：" + user);
    		} catch (IOException e) { 
    			System.out.println("application.properties属性文件读取异常" + e);
    		}
    		System.out.println("application.properties属性文件读取完成");
    	}
    
    	public static String getUser() { 
    		System.out.println("获取user的值：" + user);
    		return user;
    	}
    
    }

3、创建测试类（MyController.java）

package com.jeff.controller;
    
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    import com.jeff.utils.PropertiesUtil;
    
    @RestController
    public class MyController { 
    
    	@RequestMapping("myTest")
    	public String myTest() { 
    		PropertiesUtil.getUser();
    		return "success";
    	}
    
    }

4、打开浏览器访问 **http://localhost:8080/myTest**,控制台输出结果  
![在这里插入图片描述][20191225163526283.png]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTczOTcyMA_size_16_color_FFFFFF_t_70]

[20191225163526283.png]: https://img-blog.csdnimg.cn/20191225163526283.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTczOTcyMA_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20191225163625698.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTczOTcyMA==,size_16,color_FFFFFF,t_70